Wow, that last one up there is pretty gnarly. Looks like they took the movie Ghostbusters and did zombie versions. I wish I could see more of the detail.
As an aside, I have to say I've always preferred the look of the Real Ghostbusters designs to any attempt to “caricature” the movie Ghostbusters. Probably because I grew up with RGB. It was in that same vein of Inspector Gadget and He-Man “cartoony but not too cartoony.” I even liked the different colored uniforms, and I know I'm gonna get raked over the coals for that but hey, I gotta be me.
At least, I liked the designs until the Slimer! cartoons. Those were terrible. I don't think that's a very controversial statement to make around here.